Bathtub faucet



FIG. 1 is a top, front, left-side perspective view of a bathtub faucet showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side-elevational view thereof, the right side being mirror symmetrical thereto;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a bathtub faucet, as shown and described. 